You need:
http://dev.bukkit.org/bukkit-plugins/skript/
How you can install it?
1. You need to install Skript in your pluginsfolder
2. Download the Skript and put it into plugins/skript/scripts folder
3. Start the server or use /sk reload KillAll
Information:
Command: /killall
Permission: mc.killall
With this command u can kill all mobs from the server.
If u need help u can ask me!
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